So, will using 12v batts not increase the torque output of the motor. Just seems like it should considering it would be capable putting out twice the amperage than a conventional series wired battery system pending that you have a high amp controller. Again, this is just my thoughts and nothing i have tried yet.

Paralleled batteries give you the same voltage and double the amperage, seriesed batteries double the voltage with the same amperage.

Relatively speaking, a 12v battery has about 100 amps and a 6v battery has about 200 amps, the end result is about the same.

I'd stick with 6v batteries and call it good.

Today

BGW

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This is kinda a catch 22.
as scottyb suggested it's nice to upgrade all at once.You really need batteries, but buying 6 x 6 volt will keep U at 36 Volt.

Buying 6 x 8 would be the Ideal solution , but you need to check the controller
to see if it is labeled 36/48 volt (I doubt it since it's stock).
You will also need to upgrade solenoid(s) to 48 Volt.

If you are never going to use the bag-well (non golf use) you could get new 36 Volt Battery and then add 2 x 6 volt later (waiting too long is not good) to bag-well
So start with the Cable upgrade and upgrade ALL #6 to #4's or #2's.
Then make a decision on the other stuff and start accumulating parts until U'r ready to switch.

The motor is OK as is and can handle the added voltage.

No need to use the bag well for 2 more 6 volt batteries. With the lift you have enough room under the body to add a battery tray big enough for 2 batteries. Also with eight 6 volt batteries you will have increased run time and more availible amps for a bigger controller than would be availible with six 8 volt batteries.

Thanks for all your input. I went ahead and started phase I of my upgrades today. I went and bought some #2 welding cable and lugs along with some heavy duty resin coated heat shrink. Later I'll go ahead and go all out on the controller so it will be good for any future upgrades. Then hd solenoid and f/r switch. Then I'll just go ahead and do 8 6v batteries when my current ones die. If I'm still not pleased after all that, then I'll get The Beast or some comparable motor. It may be a year before all this is completed. Unless I really get the bug and do it all next week. Anyway, thanks for all your help and suggestions.